<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>变量</title>
  <style>
    :root {
      --blue: #623855;
      --white: #faf0e6;
    }

    body {
      background-color: var(--blue);
    }

    h2 {
      border-bottom: 2px solid var(--blue);
    }

    .container {
      color: var(--blue);
      background-color: var(--white);
      padding: 15px;
    }

    button {
      background-color: var(--white);
      color: var(--blue);
      border: 1px solid var(--blue);
      padding: 5px;
    }
  </style>
</head>
<body>
<div class="container">
  <h2>Welcome to Shanghai!</h2>
  <p>Shanghai is one of the four direct-administered municipalities of the People's Republic of China.</p>
  <p>Shanghai is one of the four direct-administered municipalities of the People's Republic of China.</p>
  <p>
    <button>Yes</button>
    <button>No</button>
  </p>
</div>
</body>
</html>